Figure 1: Group 7 halogens — reactivity decreases going down as the outer shell moves further from the nucleus.
This diagram covers Group 7 Halogens within Group 7: Halogens for GCSE Chemistry. Revise Group 7: Halogens in Atomic Structure for GCSE Chemistry with 22 exam-style questions and 21 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 2 of 12 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.
Practice questions for Group 7: Halogens
How many electrons do halogens have in their outer shell?
Explain why chlorine is more reactive than bromine.
Quick recall flashcards
Will Br₂ + NaCl react?
NO — bromine is less reactive than chlorine
Cl₂ + 2KBr → ?
2KCl + Br₂ (chlorine displaces bromine)